Quantifying the 'reverse water gas shift' reaction inside a PEM fuel cell

被引：55

作者：

Gu, T ^{[1
]}

Lee, WK ^{[1
]}

Van Zee, JW ^{[1
]}

机构：

[1] Univ S Carolina, Dept Chem Engn, Columbia, SC 29208 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2005年 / 56卷 / 1-2期

关键词：

proton exchange membrane fuel cell (PEMFC); reformate; reverse water gas shift (RWGS) reaction; CO stripping; pressure and temperature effects;

D O I：

10.1016/j.apcatb.2004.08.016

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Reformed gas containing Co-2, N-2, and H-2 may be used in proton exchange membrane fuel cells (PEMFCs), and recent evidence has shown that CO2 can react in situ with H-2 (i.e., a reverse water gas shift (RWGS) reaction) and produce adsorbed CO that can poison the electrode catalyst. Here, a study is presented to extend the previous observations by considering how pressure, gas composition, and temperature affect this reaction in a PEMFC for both Pt and Pt/Ru alloy catalysts. The coverage of CO produced on the electrodes was determined by stripping cyclic voltammetry (CV). The data show how the CO stripping potential depends on temperature, and how the analysis allows the determination of an activation energy. The data are shown to be consistent with a kinetic catalytic model and not with an equilibrium model. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：43 / 49

页数：7

共 11 条

[1] ON THE NATURE OF REDUCED CO2 AN IR SPECTROSCOPIC INVESTIGATION [J].